If you are doing 3 nights out of disney and 3 nights at, I would
suggest you do the 3 nights off site first then the 3 nights at disney. Because if you stay off site at the end of your vacation I can almost guaranty that you will regret that you left the disney site

. So start with off-site then it will be like upgrading the magic as you're vacation moves along.
I used to stay off-site, my first 4-5 times, then for a special occasion I took my reservation on-site and since then I will never,nerver,never go back off-site. The magic was unreal and
more relaxing when going and leaving the parks.:D